ML7012-04 Просмотр технического описания (PDF) - Oki Electric Industry

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ML7012-04

2400 bps Single Chip Full Duplex Data Modem with Protocol

Oki Electric Industry 

1Semiconductor

FEDL 7012-04-01

ML7012-04

Examples of Level Diagram

(1) Modem transmit: VDD ≥ 3 V

AOUT = –20 dBm, RCAO = –20 dBm, TXAN = –14 dBm, TXAP = –14 dBm, LINE = –16 dBm

(S34 = 2 dB (initial value), R5/R4 = 2, transformer loss = 2 dB)

(2) DTMF transmit: VDD ≥ 3 V: high group level

The low group levels are approximately 1 dB smaller than the values below.

AOUT = –14.5 dBm, RCAO = –14.5dBm, TXAN = –8.5 dBm, TXAP = –8.5 dBm, LINE = –10.5 dBm

(S35 = 0 dB (initial value), R5/R4 = 2, transformer loss = 2 dB)

(3) Modem transmit: VDD ≥ 2.7 V

AOUT = –20 dBm, RCAO = –20 dBm, TXAN = –15.9 dBm, TXAP = –15.9 dBm, LINE = –17.9 dBm

(S34 = 2 dB (initial value), R5/R4 = 1.6, transformer loss = 2 dB)

(4) DTMF transmit: VDD ≥ 2.7 V: high group level

The low group levels are approximately 1 dB smaller than the values below.

AOUT = –14.5 dBm, RCAO = –14.5 dBm, TXAN = –10.4 dBm, TXAP = –10.4 dBm, LINE = –12.4 dBm

(S35 = 0 dB (initial value), R5/R4 = –1.6, transformer loss 2 dB)

(5) Maximum modem receive:

LINE = –9 dBm, connecting point of R6, and R7 = –11 dBm, GSR = –15 dBm

(R8/R7 = 0.63 = –4 dB, transformer loss = 2 dB)

(6) Minimum modem receive

LINE = –40 dBm, connecting point of R6 and R7 = –42 dBm, GSR = –46 dBm

(R8/R7 = 0.63 = –4 dB, transformer loss = 2 dB)

Connection of Crystal Oscillator

Connect a 11.0592 MHz crystal unit and a 1 MΩ feedback resistor between OSC0 and OSC1.

The values of capacitors C01 and C02 connected between OSC0 and GND, and OSC1 and GND vary with the load

capacitance of the crystal unit and the wiring capacitance of the board. Set the values by the crystal manufacture’s

matching evaluation.

If an external clock is used, input it to OSC0.

C01

15 pF

11.0592 MHz

C02

15 pF

OSC0

ROSC

1 MΩ

OSC1

20/22

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